Witam Iro.345,
Probably a redirect from that uri
URLs that redirect found in: -http://www.rzeszowiak.pl/Praca-Zatrudnie-3040011155
1: -http://hospicjum-podkarpackie.pl/images/pomoc_dla_hospicjum.gif -> -http://www.hospicjum-podkarpackie.pl/images/pomoc_dla_hospicjum.gif
Probably not this SEO link being flagged: -https://kryogenix.org/code/browser/searchhi/
Likely it is a blocking for some porn sites that share that same IP you have.
Wait for an avast team member to reconsider the blocking, as we here are just volunteers with relevant knowledge.
Only avast team members can come and unblock, so wait for their final verdict on the website.
pozdrawiam,
polonus (volunteer 3rd party cold reconnaissance website security analyst and website error-hunter)